---
title: "Changes to Update Chapter"
method: POST
path: "/v1/studio/projects/{project_id}/chapters/{chapter_id}"
---

# Changes to Update Chapter

`POST /v1/studio/projects/{project_id}/chapters/{chapter_id}`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 108 revisions.

- **2026-07-13** `009bd651509a`: 6 info
- **2026-06-08** `37fac3c5a2d7`: 2 info
- **2026-04-03** `deb5e58ddddf`: 2 info
- **2026-02-08** `5b595807512c`: 4 info
- **2025-05-16** `503db4198a44`: 1 info

## Changes

- **2026-07-13** `009bd651509a`: 6 info
  - response property `chapter/content/blocks/items/nodes/items/anyOf[subschema #1: ChapterContentBlockTtsNodeResponseModel]/voice_id` deprecated
  - response property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/voice_statistics/anyOf[subschema #1]/items/voice_id` deprecated
  - added the required property `chapter/content/blocks/items/nodes/items/anyOf[subschema #1: ChapterContentBlockTtsNodeResponseModel]/project_voice_ref_id` to the response with the `200` status
  - added the required property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/voice_statistics/anyOf[subschema #1]/items/project_voice_ref_id` to the response with the `200` status
  - the response required property `chapter/content/blocks/items/nodes/items/anyOf[subschema #1: ChapterContentBlockTtsNodeResponseModel]/voice_id` became read-only for the status `200`
  - the response required property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/voice_statistics/anyOf[subschema #1]/items/voice_id` became read-only for the status `200`
- **2026-06-08** `37fac3c5a2d7`: 2 info
  - added the optional property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/credits_needed_to_convert` to the response with the `200` status
  - added the optional property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/voice_statistics/anyOf[subschema #1]/items/credits_needed_to_convert` to the response with the `200` status
- **2026-04-03** `deb5e58ddddf`: 2 info
  - added the optional property `chapter/has_visual_content` to the response with the `200` status
  - added the optional property `chapter/statistics/anyOf[subschema #1: ChapterStatisticsResponseModel]/voice_statistics` to the response with the `200` status
- **2026-02-08** `5b595807512c`: 4 info
  - api operation id `Update_chapter_v1_studio_projects__project_id__chapters__chapter_id__post` removed and replaced with `edit_chapter`
  - added the new optional request property `content/anyOf[subschema #1: ChapterContentInputModel]/blocks/items/sub_type`
  - added the optional property `chapter/has_video` to the response with the `200` status
  - added the optional property `chapter/voice_ids` to the response with the `200` status
- **2025-05-16** `503db4198a44`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/docs/v1/studio/projects/:project_id/chapters/:chapter_id/post.md) - [API](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation.md) - [Page](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/changes/v1/studio/projects/:project_id/chapters/:chapter_id/post)